Electrical alarm



(Nb Model. 1 2 Sheets-"Sheet 1.

J. AWGALVIN ELECTRICAL ALARM. No. 366,212. Patented July 12, 1887.

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(No Model.) 2 Sheets-Sheet 2..

J. A GALVIN.

ELECTRICAL ALARM.

No. 366,212. Patentd July 12, 1887.

IINTTED STATES PATENT @FHQEQ J AMES A. GALVIN, OF STEEL'ION, PENNSYLVANIA.

ELECTRICAL ALARM.

SPECIFICATION forming part of Letters Patent No. 366,212, dated July 12, 1887. Application filed February 10, 1887. Serial No. 228,230. (No model.)

To all whom it may concern:

Be it known that I, JAMES A. GALVIN, a citizen of the United States, residing at Steelton, in the county of Dauphin and State of Pennsylvania, have invented a new and useful Improvement in Electrical Alarm Apparatus, of which the following is a specification.

The invention relates to improvements in electrical alarm apparatus, and is of the same class as burglar-alarms, the object being to indicate by means of the lighting of an electric lamp situated in a sleeping-apartment or other place where it will attract attention the extinguishing of an electric night-lamp in a store, oflice, or other place where it may be necessary, whether the said extinguishmentis produced by severing the wires of the nightlamp circuit or whether by an accident that will interrupt the current through said circuit, such as the breaking of the carbons in the case of an are light.

A further object of the invention is to indicate by means of the ringing of a bell where said night-lamp circuit is interrupted, and also where the main circuit is interrupted by cutting the main wires, stopping the dynamo, or other cause.

The invention consists of the construction and novel arrangement of parts, hereinafter pointed out in the claims hereto appended.

In the accompanying drawings, Figure 1 represents a plan or diagram of the apparatus embodying the invention, one indicator-lamp only being used. Fig. 2 represents a plan or diagram of the same ,when two indicatorlamps are used, each connected with a separate night-lamp.

Referring to the drawings by letter, P and N represent, respectively, the positive and negative wires of the main circuit.

A represents anindicator-lamp of ordinary or. any desired construction, and either an are or incandescent lamp. The said lamp is situated in a sleeping-apartment or in .any place where its lighting will attract attention, and it rests upon a supporting-frame, a, of proper shape and construction for the attachment of other parts of the apparatus, the said frame being of non-conducting material.

Bis a bell or gong, of ordinary construedescribed, illustrated in the drawings, and

tion, situated near the lamp A and provided with the hammer I), and resting on a non-eon ducting support.

0 is a lamp designed to be left lighted at night in a store or other place of business, and D is an electro-magnet suspended from the upper rail, a, of the frame a and provided with the core (I.

e is a metal rod depending from the rail (1. and connected by the metal strip 0' with the screw of the binding-post E, the said screw passing through the rail a.

f is a metal strip secured to the frame a, and having the negative wire F of the indicatorlamp A electrically connected to'its upper end. The lower end or foot, f, of the metal strip f is in position to be touched by the end of the outer arm of the metal bar G, pivoted on the lower end of the rod 0. The inner arm of said bar is extended by the piece 9, of hard rubber or other non-conductor, which piece has socured to its end the soft-iron armature g in position to make contact with the core (Z when the magnet D is excited.

H and I are respectively the positive and negative binding-posts of the said magnet, the former connected with the positive main wire P by the wire it and with the magnet by the wire h, and the latter connected with the end So of the coil 2' of the magnet.

t" is a wire connecting the binding-post I with the night-lamp C, and i is a wire connecting said lamp with the negative main wire N.

j is a wire running from the binding-post H and connecting with or being a continuation of the positive wire J of the indicator-lamp.

j is a wire connecting the bindiugpost It with the main negative wire N. 0

Now, when the lamp 0 is burning, there is a current from the main positive wire I through the wire h to the binding-post H, thence through the Wire h to and through the coil i of the magnet D and to the binding- 5 post I, thence to the lamp through the wire a", and through the lamp and the wire '6' to the main negative wire N. This current excites the magnet D, so that the core (Z attracts the armature g and prevents the end of. the bar G from making contact with the foot f of the strip f, so that no current can be established r it 266,212

through the indicator-lamp A. If the nightlamp 0 be extinguished from any cause, the above-described current will cease, the magnet D become inert, and the core (1 consequently cease attracting the armature g',which will fall away therefrom, the inner arm of the bar G being made sufficiently heavy for that purpose. The end of the bar G then makes contact with the foot f, and a current is immediately produced from the positive wire P through the wire h to the binding-post H, thence through the wire j and the positive wire J of the indicatorelamp, thence through the negative wire F to the depending strip f, and from the footf of the same through the bar G, rod 0, and strip 6 to the binding-post E, whence it passes through the wire'j to the main negative wire N. The current, in fact, does not cease through the wire it to the binding-post H; but when the lamp 0 is extinguished it is deflected from the wire h, going to the magnet,to the wire going to the indicator-lamp, so as to cut out the magnet and to light the lamp; but the description of the entire circuit in each case gives a clearer description 'of the connections, and therefore such has been given. Upon re-establishing the night-lamp O the indicator-lamp A is extinguished.

The apparatus by which the as follows:

K K are the cups or sections of a galvanic battery, joined by the wire 70, and L L are respectively the negative and positive bindingposts thereof, the post L being connected by the wire I to the section K, and the wire Z connecting the post L and the section K.

M is a wire running from the post L to the metal connector in of the bell, and a is a wire connecting the binding-post Lwith a metallic standard, N, secured upon the lower rail, a, of the frame a, from which rail the said binding-posts depend. The said standard has its upper part bent horizontally and in position to be touched by a copper circuit-breaker,

bell is rung is O, secured upon the insulating-piece 9, but

having no electrical connection with the armature'g.

0 is a wire running from the circuit-breaker O to one end of the circuit-breaker 1?,which is arranged to make and break contact with the lower end of a wire,p, the upper end of which runs to themetallic connector 19 of the bell,the electric apparatus of which is of ordinary construction. It is evident that when the magnet D becomes inert from any cause, whether from the failure of the night-lamp circuit or the main circuit, the armature will fall from the core 01 and a circuit will be established from the battery K K,the current passing successively through the Wire Z, binding-post L, wire a, standard N,cireuit-breaker O,wire circuit 0, circuit-breaker P, and wirep, connector p, to the bell mechanism,and from the bell, through the connector m, wire M, binding-post L, and wire I, to the battery.

Thus the, bell will ring whenever the magnet becomes inert.

X X X are lamps in the main circuit that have no connection with and are not effected by the described apparatus. More than one night-lamp may have such an apparatus and a corresponding indicator-lamp connected w th it; but only one bell will be necessary. Fig. 2 shows two indicator-lamps each for a separate night-lamp, but only one belt-the bell giving the alarmand the lamp indicating the place of the night lamp interfered with. In this construction two circuit-breakers P are used and are connected by a wire, q. The bin ding-post L also is connected with eachstand: ard N,so that the bell will ringwhen e ther of the magnets D is thrown out of circuit, the current being as heretofore described when the left-hand magnet is cut out, as shown; but when the right-hand magnet is cut out the current passes from the binding-post L to the right-hand standard N, thence to the corresponding circuit breaker P, and thence through the wire q to the opposite circuitbreaker, whence. its course is as before. Each indicator-lamp in this constructionhas aseparate magnet D and mechanism similar to that described. The binding-post H connects with each magnet D, but each has a separate binding-post I. The binding-postE also connects with each metallic strip e,but does so by means of a wire, 0 with the strip on the right hand. The circuit making and breaking mechanism is similar in each. and similarly lettered. In Fig. 2 theleft-hand lamp is shown lighted and its circuit complete, the corresponding magnet being inert. The bell is also sounding, as its lefthand circuit is complete. The right-hand lamp is out of circuit, as the corresponding magnet is excited. By means of each of the circuitbreakers l? the bell can be cut out from the corresponding circuit, so as to sound only when certain night-lamps are interfered with.

Having described my invention, I claim 1. In an electric alarm, the combination, with the main circuit and the night-lamp circuit running from the positive wire to the negative wire of the main circuit, and includ ing the night-lamp and the magnet, substantially as described, of the indicator-lamp cir cuit running from the positive to the negative wire of the main circuit, including the indicator-lamp, and a circuit making and breaking mechanism, substantially as described, whereby the breaking of the night-lamp circuit and consequent demagnetization of the magnet establishes the current of and lights the Q mature g, the bar 0, strip 6', and binding-post E, and the circuit-breaker o N, substantially as specified.

3. The combination, with the main circuit, the night-lamp circuit, and the night-lamp and magnet having the coil included in said circuit, of the bell B, the battery K K, the bellcircuit including the bell, the battery, and a circuit making and breaking mechanism consisting of the bar G, the insulator-piece g, the armature g, the circuit-breaker O, and the standard N, substantially as specified.

4. The combination of the main circuit, the night-lamp circuit, the lamp and magnet having the coil included in said circuit, the bellcircuit, the battery and bell included in said circuit, the indicator-lamp circuit, the indicator-lamp included therein, and a circuit making and breaking mechanism partly in the bell-circuit and partly in the indicatonlamp circuit, and consisting of the strip f, pivoted bar G, rod 0, strip 0, insulatingpiece armature g, circuit-breaker O, and standard N,

all constructed and arranged substantially as specified.

broken thebell will be rung, substantially as' specified.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in presence of two witnesses.

JAMES A. GALVIN.

Witnesses:

WM. GREEN, WILLIA F. BAMAN. 

